Stencil duplicating device



Feb. 10, 1953 GREENBERG $627,808

STENCIL. DUPLICATING DEVICE Filed July 25, 1949 I NV EN TOR.

I85 22 15m- E G/PMNBE/PG Patented Feb. 10, 1953 STENCIL DUPLICATING DEVICE Elbert E. Greenberg, Cincinnati, Ohio Application July 25, 1949, Serial No. 106,561

2 Claims.

This invention relates to a stencil type duplicator and more particularly to a hand operated duplicator.

An object of this invention is to provide a stencil type duplicator which can be hand op erated and which is adapted to print material applied to a stencil sheet by typing, or lettering etc.

A further object of this invention is to provide a simple, inexpensive clamping means for a hand duplicator for holding the stencil of a hand duplicator.

A further object of this invention is to provide a hand operated duplicator having a built-in ink pad which is readily accessible.

Briefly, this invention provides a duplicator which includes a backing block having a cylindrical printing face to which an ink pad is attached. Angle-shaped clamps extend along sides of the backing block to grip edges of a stencil sheet which overlies the ink pad. The ink pad terminates short of the sides of the backing block. The clamps are mounted on studs which project from the sides of the backing block, and a rubber band or the like holds the clamps against the sides of the backing block in position where a clamp flanges that form parts of the clamps can engage edges of the stencil sheet and hold the edges of the stencil sheet against the printing face of the backing block in the spaces between the sides of the block and the ink pad.

The above and other objects and features of the invention will in part be obvious and will in part be apparent from the following detailed description and the drawing, in which:

Figure 1 is a perspective View showing a duplicator constructed in accordance with an embodiment of this invention;

Fig. 2 is a view in end elevation, partly broken away in transverse section of the duplicator illustrated in Fig. 1; and

Fig. 3 is a perspective view showing one of a pair of clamps which form a part of the duplicator illustrated in Fig. 1.

In the following detailed description and the drawing, like reference characters indicate like parts.

In Figs. 1 and 2, a duplicator is shown which includes a substantially flat, stiff backing block having a cylindrically curved working or printing face I2. An ink pad I3 is attached to the printing face covering the printing face with the exception of a narrow peripheral edge l4 thereof, the sides of the ink pad 13 terminating '2 short of side walls I4 of the backing block. The backing block [0 may be formed of any suitable stiff material, for example hard wood, while.

the ink pad [3 may be formed of fibrous material such as felt or the like which is suitable for holding duplicator ink. An upper face l5 of backing block I0 is equipped with a frusto-conical well [8 in which' a tip of a removable handle I! may be disposed and frictionally held.

A stencil sheet I8 is adapted to cover the entire ink pad extending beyond the pad on all sides. The stencil sheet l8 may be of the mimeograph type and may be provided with typed, outlined, or otherwise applied indicia through which ink from the pad I3 can penetrate for printing postcards or the like. Opposite edges of the stencil sheet l8 are held by clamps l9, one of which is shown in detail in Fig. 3. Each clamp I9 is of generally angle shape and includes a main flange 2| which is adapted to extend along one of the walls I4 of the backing block and a clamping flange or lip 22 which is adapted to engage an edge of the stencil sheet 18 and hold the edge against the printing face of the backing block at the edge l4 thereof beyond a side of the ink pad 13. Preferably, as shown in Fig. 2, the clamping flanges normally may be slightly spaced from the backing block but can engage and grip the stencil sheet against the backing block. A pair of spaced perforations 23 in the main arm of the clamp receive screws or studs 24 which extend outwardly from the sides I4 of the backing member. The studs 24 serve as stops holding the clamp arms down as shown in Fig. 2 to cause the clamp arms to engage the stencil sheet l8.

As shown in Fig. 2, each clamp may swing between an engaged position, shown in full lines in Fig. 2, in which the clamping flange may engage the printing face of the backing block to grip an edge of the stencil sheet l8, and a released position shown in dot-dash lines, in which the stencil sheet is released. Edges of the upper face of the backing block are cut away or rabbeted as indicated at 26, and the clamps can pivot about a bearing edge 21 between the rabbeted portion of the back of the block and the side of the backing member.

As shown in the drawings, opposite ends of the main flanges of the clamps are notched as indicated at 28, and a resilient band 29 of rubber or the like extends about the backing block and the clamps being held in the notches 28. As shown in Fig. 1, the clamp arms are slightly longer than the sides of the backing block so that the notches 28 can hold the rubber band 2b, the band being substantially flush with or slightly spaced from ends 30 of the backing block. The notches of each clamp are on a line spaced between the perforations 23 and the clamp flanges 22 and are between the bearing edges 21 and the clamp arms so that the rubber band holds the clamp arms normally in engaged position. However, when desired, the clamps may be swung to released position by finger pressure along free edges of the main arms to release one edge of the stencil for access to the ink pad or to release both edges of the stencil for removing the stencil.

When the duplicator is to be used, the stencil sheet is prepared in the usual manner, and the inking pad is given a uniform application of ink. Then the stencil sheet is placed over the inking pad, extending beyond the inking pad on all sides, and is clamped in place as shown in Fig. 1.. Then, the handle I? is held and the pad isrolled across a card or other paper or the like to be printed, whereupon ink on the ink pad penetrates through the stencil to print the sheet. When additional ink is required on the ink pad one of the clamps may be released and the stencil sheet may be swung back to reveal the ink pad, and when the stencil is to be replaced, both clamps may be released to permit removal of the stencil.

As will be apparent, springs of various forms may be substituted for the rubber band 29. For example, tension springs may be substituted extending between clamps 19 across ends of the backing member. Or compression springs may be provided about the shanks of the studs bearing against the heads of the studs and the outer faces of the clamps.

The embodiment of the invention described above and illustrated in the drawing is subject to modification without departing from the spirit and scope of the appended claims.

Having describedmy invention what I claim as novel and desire to secure by Letters Patent is:

l. A hand duplicator which comprises a stiif solid backing block having ends, side faces, a back and a cylindrically convex printing face, an ink holding pad attached to said printing face, a pair of clamps adapted to hold edges of a stencil sheet covering said ink pad, each of said clamps extending along one of the sides of the backing block and having a flange adapted to grip an edge of the stencil, each of said clamps containing a pair of spaced perforations, a pair of spaced studs extending outwardly from each of the lengthwise sides of the backing block and through the perforations in one of the clamps, said perforations being of greater diameter than the studs, said. clamps each being adapted to swing on said studs between a closed position in which the clamps are adapted to engage and hold edges of the stencil against the backing block and an open position in which the clamping flanges are swung away from the backing block, and resilient means for urging the clamping flanges into engagement 4 with the stencil, the sides of the clamping members remote from the clamping flanges projecting free of the back face of the block and being manually engageable for swinging the clamping members out of stencil-engaging position.

2. A hand stencil duplicator comprising a solid body block having flat ends, a pair of fiat side faces, a back, and a cylindrically convex working face having an axis parallel to the sides and back of said block, a pair of mounting studs attached to and projecting outwardly from each side face of said block spaced from the working face of the block, a pair of clamping members, each of said clamping members having a main flange mounted on the pair of studs extending from one of the side faces and a clamping lip adapted to engage an edge of a stencil sheet and hold the edges of the stencil sheet against the working face, shanks of the studs extending through perforations in the clamping member of greater diameter than the shanks of the studs, each of said clamping members being adapted to swing about the juncture of the back with one of the side faces of the block between an engaged position in which the clamping lip is adapted to engage the edge of the stencil sheet and hold the edge of the stencil against the working face of the body block and released position in which the clamping lip is spaced from the working face of the body block, the clamping members being longer than the body block and having ends extending beyond opposite ends of the body block, the ends of said clamping members being notched, the clamping members bearing on the backing block on a line spaced a greater distance from the clamping lip than the notches, a resilient band disposed in said notches and embracing the clamping members and the body block and constantly exerting a force tending to dispose the clamping members in engaged position, and an ink pad aflixed to said working face and terminating short of the portion thereof engaged by the clamping lips, the clamping lips being adapted to engage opposite side edges of the stencil sheet and dispose the stencil sheet in covering relation upon the ink pad, the sides of the clamping members remote from the clamping lips projecting free of the back face of the block and being manually engageable for swinging the clamping members out of stencilengaging position.

ELBERT E. GREENBERG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Thompson s May 18, 1937 

